Do{}while stopping condition

Question

Hi,
I am having trouble with my stopping statement! I want all the items to evaluate to true before it stops:
do{...}while(px!=x && py!=y && entryDir!=S)
I am tracing around the outline of a character, the trouble is as soon as it get to the top of the letter and the entryDir changes it stops...
So it should stop when px = x, py = y and the entry direction into the starting pixel (x,y) was S (south).
Thanks, Ron
Message was edited by:
cake

Answer 1

Here is the rest of the code, just to make sure...
public void getMooreBlob(int x, int y){
     char N='N', E='E', S='S', W='W';
     int px=x, py=y, nextMove=1;
     downSampleLeft = downSampleRight = x;
     downSampleTop = downSampleBottom = y;
     System.out.println("left="+x+"right="+x+"top="+y+"bottom="+y);
     //I am always going to be entering from the south to start, scanning down
     char entryDir = S;
     do{
     //pixel positions relative to p
          switch (nextMove)
               //move1
               case 1:
                    if(loadImg.getRGB((px+1),(py-1))!=-1){
                         entryDir='E';
                         px=px+1; py=py-1;
                         setP(px, py);
                         nextMove=7;
                         break;
               //move2
               case 2:
                    if(loadImg.getRGB((px+1),py)!=-1){
                         entryDir='S';
                         px=px+1; py=py;
                         setP(px, py);
                         nextMove=1;
                         break;
               //move3
               case 3:
                    if(loadImg.getRGB((px+1),(py+1))!=-1){
                         entryDir='S';
                         px=px+1;py=py+1;
                         setP(px, py);
                         nextMove=1;
                         break;
               //move4
               case 4:
                    if(loadImg.getRGB(px,(py+1))!=-1){
                         entryDir='W';
                         px=px;py=py+1;
                         setP(px, py);
                         nextMove=3;
                         break;
               //move5
               case 5:
                    if(loadImg.getRGB((px-1),(py+1))!=-1){
                         entryDir='W';
                         px=px-1;py=py+1;
                         setP(px, py);
                         nextMove=3;
                         break;
               //move6
               case 6:
                    if(loadImg.getRGB((px-1),py)!=-1){
                         entryDir='N';
                         px=px-1;py=py;
                         setP(px, py);
                         nextMove=5;
                         break;
               //move7
               case 7:
                    if(loadImg.getRGB((px-1),(py-1))!=-1){
                         entryDir='N';
                         px=px-1;py=py-1;
                         setP(px, py);
                         nextMove=5;
                         break;
               //move8
               case 8:
                    if(loadImg.getRGB(px,(py-1))!=-1){
                         entryDir='E';
                         px=px;py=py-1;
                         setP(px, py);
                         nextMove=7;
                         break;
               default:
                    nextMove++;
                    if(nextMove==9)nextMove=1;
                    break;
     }while(px!=x && py!=y && entryDir!=S);
}